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Acquisitions - Estimated Fair Values of Identifiable Intangible Assets and Related Weighted Average Amortization (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2018
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date |  | $ 116,600
Acquisitions 2018 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 19,836 |
Weighted average amortization period at acquisition date | 10 years 2 months |
Customer relationships | Acquisitions 2018 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 3,328 |
Weighted average amortization period at acquisition date | 5 years |
Backlog | Acquisitions 2018 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 1,055 |
Weighted average amortization period at acquisition date | 1 year |
Trade names | Acquisitions 2018 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 6,257 |
Weighted average amortization period at acquisition date | 15 years |
Non-compete agreements | Acquisitions 2018 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 196 |
Weighted average amortization period at acquisition date | 5 years |
Curriculum | Acquisitions 2018 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 9,000 |
Weighted average amortization period at acquisition date | 10 years |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References No definition available. + Details
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